Valve-gear for explosive-engines.



PATENTED NOV. s, 1904.

A. BOUGAULT.

VALVE GEAR FOR EXPLOSIVE ENGINES.

APPLICATION FILED SEPT. 21,1903.

2 SHEETS-SHEET 1.

.NO MODEL.

W m w L PATENTED NOV. 8, 1904 A. BOUGAULT. VALVE GEAR FOR EXPLOSIVEENGINES.

APPLICATION FILED SEPT. 21, 1903.

SHEETS-SHEET 2.

N0 MODEL.

UNITED STATES Patented November 8, 1904.

PATENT OFFICE.

ALFRED BOUGAULT, OF PARIS, FRANCE, ASSIGNOR TO THE SOOIETFI FRANOAISE DEOONSTRUGTIONS MECANIQUES (AN OIENS ETABLISSE- MENTS (JAIL), OF PARIS,FRANCE.

VALVE-GEAR FOR EXPLOSlVE-ENGINES.

SPECIFICATION forming part of Letters Patent N0. 774,554, dated November8, 1904.

Application filed September 21,1903. Serial No. 174,123. (a. model.)

T 0 all whom, it may concern.-

Be it known that I, ALFRED BOUGAULT, engineer, a citizen of the FrenchRepublic, residing at 21 Rue de Londres, Paris, France, have inventedcertain new and useful Improvements in Valve-Gear for Explosive-Engines,of which the following is a specification.

This invention has for its object to provide an improved valve-gear forexplosive-engines, and is especially; applicable to motors governed byvarying the quantity of explosive mixture drawn in by suction.

In order that my invention may be clearly understood, I shall describeit with reference to the accompanying drawings, of which Figure 1 is asection of a device according to my invention. Fig. 2 is a section ofthe same provided with means for decreasing the compression whenstarting the motor.

The exhaust-valve a is according to this invention operated by twolevers b c, acting, through the intervention of rolling surfaces, so asto decrease the power necessary to move the valve from its seat. One ofthe levers is operated by the rod (Z of an eccentric e, (keyed on thevalve-gear shaft f,) so that the motion of the valve is invariablewiththat of the engine-piston. The exhaust-valve opens with a suitable leadand closes toward the end of the stroke which expels the burned gases.

One part only of the stroke of the eccentric 0 (shown on Fig. l beneaththe lever c) is used to operate the valve, the remaining part of theeccentrics stroke being utilized to increase the tension of thevalve-closing spring g during the engine-pistons suction-stroke whichfollows the stroke which expels the burned gases. The maximum excess ofcompression of the exhaust-valve spring corresponds' to about the end ofthe suction-stroke. By this arrangement the exhaust-valve a is relievedof part of the pressure of the valveclosing spring at the moment itbegins to rise, the tension of the said spring 9 remaining constant thewhole of the time the valve is being lifted. It is possible to give thevalve-spring g suflicient tension to prevent the valve being unseated bythe action of excessive vacuum in the cylinder.

The device may be provided with means for decreasing the compression instarting the motor, Fig. 2. The means for decreasing the compressioncomprise a roller it, carried by a rod j, hinged to the extended end ofthe lever 72. The oscillation of the rod is controlled by a lever k, thelower end of which is joined to the roller h by a rod m. The lever iscan occupy the positions 7:; 7c Z9 To these positions correspond thepositions 7; it if of the roller. The arm n of the lever 0 is providedwith a stop 0, which can at stated time be brought into contact with theroller it in order to insure the decreasing of the compression instarting the motor when the lever is brought to the position it. Theroller is then in the position it. When the great radius of theeccentric 6 travels through the angle corresponding to the stroke ofcompression, the stop 0 comes into contact with the roller 7a and raisesthe valve a through the rod on and the lever b to the height which isnecessary for decreasing the compression in the cylinder. hen the motorhas reached the desired speed, the lever is brought to the position If.The roller is then brought in the position if, in which position it canno more come into contact with the stop 0. The valve (0 is no moreraised during the compressionstroke. The compression has then its normalvalue and the motor reaches its legitimate speed. 7 The lever Z9, andconsequently the roller 5., may be brought in intermediate positions inorder to modify the decreasing of the com pression.

Having thus described and ascertained the nature of my invention, Ideclare that What I claim is 1. A controlling mechanism forexhaustvalves of internal-explosion engines, having a lever adapted toopen said'valve, a second lever adapted to operate the first lever, oneof said levers being adapted to have a rolling contact upon the other, avalve-gear shaft having an eccentric, a rod operable by the eccentricand serving to actuate the second lever in a direction to operate thefirst lever to cause the opening of said valve, and anexhaustvalve-closing spring compressible by said second lever at apredetermined time.

2. A controlling mechanism for exhaustvalves of internal-explosionengines, having a lever adapted to open said valve, a second leveradapted to operate the first lever, one of said levers being adapted tohave a rolling contact upon the other, a valve-gear shaft having aneccentric, a rod operable by the eccentric aud serving to actuate thesecond lever in a direction to operate the first lever to cause theopening of said valve, an exhaust-valveclosing spring compressible bysaid second lever at a predetermined time, and manuallyoperable meansfor governing the stroke of said second lever.

B. A controlling mechanism for exhaustvalves of internal-explosionengines, having a lever adapted to open said valve, a second leveradapted to operate the first lever, one of said levers being adapted tohave a rolling contact upon the other, a valvegear shaft having aneccentric, a rod operable by the eccentric and serving to actuate thesecond lever in a direction to operate the first lever to cause theopening of said valve, an exhaust-valve closing a spring compressible bysaid second le'ver at a predetermined time, a rod jointed to said firstlever and provided With a roller, the second lever having a stop toengage said roller, and means for shifting said second rod to therebychange the position of the roller izarried thereby with respect to thesecond ever.

In testimony whereof I have hereunto set my hand in presence of twosubscribing Witnesses.

ALFRED BOUGAULT.

Witnesses:

PAUL F. PA UET, A. L. LEISSE.

